Патент USA US2117327код для вставки
May 17, 1938. l. H. lHM ET AL. ' 2,117,327 BORING MACHINE Filed March 12, 1935 29 \ \ 2 Sheets-Sheet l \\\\ 20 I5 2!’ [Fig 2 I \ ' ‘ ~19 ’ H InVen'l-m's IVAN H‘. ZHM CHARLES'f-T TUTTLE ' by...... .. .. "Attorney May 17, 1938. I. H. IHM ET AL ' BORING > 2,117,327 MACHINE Filed March 12, 1935 ‘ ‘ 2 Sheets-Sheet 2 2 l I| i l 111128111013 IVA/V H [HM CHARLES F TUTTLE Patented May 17, 1938‘ 2,117,327 UNITED STATES PATENT ‘OFFICE BORING MACHINE ‘Ivan H. Ihm and Charles'F. Tuttie, Richmond, Calif., assignors to Standard Oil Company of California, San Francisco, Calif., a corporation of Delaware Application March 12, 1935, Serial No: 10,622 . I 2 Claims. This invention relates to a boring machine and more particularly to a boring machine tool which is adapted to be used for resurfacing and similar (01. 77-58) view of the keyed feed bar used in these examples. Referring to the drawings and particularly to the grooving tool embodiment shown in Figures operations in restricted bores of heavy and rela-' ‘ 1, 2 and 3, the numeral l0 indicates a header, dia I tively immovable equipment, such as pressure still grammatically shown here in section ‘and pro headers which may be in place in a furnace. vided with the usual tubeseat bore H, with Heretofore, it has been the practice, when ma grooves l 2, and I 3, into which a tube may be rolled chining operations are required'on the grooves or expanded into .place in the conventional man and the likev of equipment such as pressure still 10 headers, to 'remove them from their place in the furnace, and take them to a machine shop, where the machining is done. Inasmuch as these ?t tings are normally ?xedly supported in the fur nace and are further secured as ?rmly as possible ner. The tapered seat l4, into which a cap or plug closure for the header is adaptedlto seat, forms with the tube seat, a restricted bore, which makes accurate machining operations on the grooves i2 and I3 particularly di?icult. ' The body l5 of the tool is ‘generally cylindrical ' 15 to the tubes, to prevent leakage and blowing off . in shape and is provided with a turning or drive due to internal pressure, this is ,a‘ very expensive and inconvenient, as well as time consuming pro cedure.‘ Certain types of alloy tubes are severe ly weakened and damaged by the heating which A guide bushing l9 substantially surrounds body usually accompanies header removal, and in some , l5 and is preferably collapsible, in this case be cases where the tubes ,are welded to the headers, ing made in three or more segments as shown, and - the tubes must be cut and destroyed, or at least, is adapted to be ?rst inserted in bore II in parts, shortened, before the headers can be taken off. It is an object of this invention to provide a 25 portable means-for doing accurate ?eld machine boring, and the like in heavy and relatively im movable equipment, such as pressure still headers. _ Another object is to provide a means for ac curately aligning and positioning a boring ma 30 chine tool in a restricted bore to operate on the same. , ‘ Another object is to provide a compact and rugged cross-teed means for a boring tool of this type. I Another object is to provide a simple and ac curate portable boring machine and guide means therefor adapted to remachine restricted bores. These and other objects will be further ap parent from the following description and from‘ 40 the appended drawings, which form a part of this speci?cation and illustrate an example of a preferred embodiment of this invention. In the drawings: _ bar I6 which may be secured thereto permanent ly, or detachably as by'the squared end I‘! which is received in a corresponding square recess iii. . i > 0 and then assembled by means of spring wire re tainers 20, which are snapped into grooves 2!. It will be noted that the bushing subtends only about 300° of the body I 5, in order to allow the 25 cutting tool and the holder therefor to be ex tended radially to reach groove l2 or l3. This proportion has been found adequate to center the body IS in bore II. ‘ Bushing I 9‘ is carried around. with tool body 30 l5, by means of the longitudinal key 22 which is secured in a key seat 23 in the body. The pe riphery of bushing‘ I9 is provided with a raised portion or ring 24, which engages groove l2, and 35 aligns the bushing longitudinally in bore ll. . There are two notches 25_ and 2G, in the trailing or driving edge of bushing l9, notch 25 being aligned with, or at least spaced from, groove I 2, and notch 2.6 located in the same relation to 40 groove l3. A lug 21 on key 22 engages either notch and aligns body I5 in bushing I 9 to operate on whichever groove is to be machined. - . Figure 1 is a side elevation view of a boring tool, 4‘ in place in, a header ‘and adapted to remachine the grooves into which the tube is expanded. The cutting tool 28, for accomplishing the ma chining is secured in a generally cylindrical‘ tool post or holder 29, as by set screws 30, 3i and 32. Figure 2 is a.vertical sectional view on line’ Holder 29 is received in a transverse bore 33 in II-II of Figure l, and illustrates the tool hold body I 5, and is movable longitudinally in said ing, feeding,‘ and guiding means of this embodi bore by means of inclined grooves 34 in which are received complementary inclined teeth 35 ‘on Figure 3 is a vertical longitudinal sectional view a cylindrical feed bar or element 36 (Figures 4, ment. ' h ’ on line III-Ill of‘Figure 2. _ Figured is a top \view of the tool‘ post used in these examples. “ “ c ‘ 7 Figure 5 is an end view and Figure 6 a bottom 5 and 6.)' ' ' ' Feed bar 36 is positioned in longitudinal bore 31 in body l5 (Figures 2 and 3), and is prevented from rotating therein by a key 38, received in . ' 2 2,117,327 a keyway 39. Feed'bar “has an axial threaded bore 40 in which a correspondingly threaded feed rotating body (l5 through the medium of drive vented from moving longitudinally therein by bar IS, with a periodical partial rotation of the feed screw extension member 41, the machining of grooves H or l3 in bore ll of the header l0 may be carried out uniformly, accurately, and to ?ange 43, secured in body l5 by a threaded lock the depth desired. screw 4i is received. Feed screw 4| extends into bore 31 through a smaller bore 42, and is pre-v nut 44. The outer end of feed screw 4|, in the example shown, is squared as at 45 to be re ceived in a correspondingly squared socket 46 10 on a removable extension member 41., which lat ter projects outwardly along drive bar~l6 (Fig ure 1) to a point where both are accessible out-v > ' It will be appreciated that this invention is adapted to other uses than that given, and may be described as involving a rotatable body carry ing a generally transversely movable tool post 10 and cutting tool, with means extending from said body for moving the tool post as may be required, and means for centering the body and also for align and support feed screw extension member ‘\ guiding it in the path which it is desired the tool will take. While a speci?c construction has 15 41 and drive bar 16, the former being retained longitudinally therein by collars 49, and ‘also been described and illustrated'to carry out these side oi’ header I0. Spacers 48 are provided»v to, in turn are secured to bar l6.» operations and functions, it is to be understood that the invention is not limited to that device, In operation, guide bushing i9 is ?rst set into bore II, with ring 24 engagingxgroove l2. Body and all such modi?cations and changes as come within the scope _of the appended claims are em I5 is then inserted in bushing l9 and rotated to engage lug 21 on key 22 in notch 25 of bushing it, if groove I2 is to be deepened. If-groove I3 is to be operated on, lug 21 is engaged in notch 20. Cutting tool 28 is then moved outwardly into braced thereby. being adapted to be rotated in spacers 48, which 20 operative position by rotating feed screw 4i, which, by virtue of-its threaded engagement with the keyed feed bar 36fmoves the latter longi tudinally in bore 31, thus sliding tool holder 29 30 transversely due to the interaction of inclined teeth 35 in grooves 34. , In one example, with a tooth and groove angle “A" (Figures 4 and 6) of about 21 degrees 48 minutes and 5 seconds, which is a slope of 4.80 35 inches in 12 inches, and with a feed screw hav- ' ing 10 threads per inch, the tool was moved out ‘ wardly from body IS a distance of 0.040 inch for each complete turn of the feed screw. Thus by We claim: ' 20 ' - ' 1. A tube seat grooving-‘tool comprising a body, a radially extensible cutter onsaid body, a guide means for said body comprising a longitudinally 25 split bushing adapted to be received within said tube seat and to engage a groove therein, means for holding said bushing in place in said- tube seat prior to the insertion of said body, and means selectively connecting said body and said 30 guide means to space said body and said cutter longitudinally in said tube seat with regard to the groove engaged by said guide means. 2. A tube seat grooving tool ‘according to claim 1 in which said bushing substantially encircles, 35 said body to align it centrally in said tube seat. IVAN H. IHM. - CHARLES F. TU'I'I'LE.